Insulating a Log Cabin from the Exterior
We’re in the process of converting a traditional log cabin built in the 1950s with chinked 6″ round silver birch logs from a (zone 4, northern Maine) seasonal camp into a full time home. We would like to preserve the interior look of these aged birch logs by adding insulation to the exterior (walls and roof) and are looking for advice to do this intelligently. The interior logs would be left exposed.
My best thinking thus far (no claim to this as good thinking ;-)) is to first put vertical 2×4 sleepers (mounted edgewise) on the exterior walls. Second step would be to spray with closed cell foam to the full depth of the sleepers, then either add a vapor/rain barrier and then horizontal siding or skip the vapor barrier and go directly to the siding.
I’d also be interested in any advice you might have for the roof deck (esp. moisture control within the assembly) for which I’m planning a vapor barrier, two layers of polyiso sheets, Zip sheathing and then Grace I&W shield with a raised seam metal roof.
My main concern is avoiding moisture buildup and future mold/rot problems. I would love to hear any advice/counsel you could give me. Thanks, Dave
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